Burglar-alarm



(No Model.)

G. ARTER. BURGLAR ALARM,

No. 411,632. Patented Sept. 24, 18 89.

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UNITED STATES PATENT EIoE.

GEORGE ARTER, OF CLEVELAND, OHIO.

' BU RG LAR-ALARM.

SPECIFICATION forming part of Letters Patent No. 411,632, datedSeptember 24, 1889.

Application filed March 25, 1889- Serial No. 304,713. (No model.)

To all whom it may concern.-

' Be it known that I, GEORGE ARTER, a citizen of the United States, anda resident of Cleveland, county of Cuyahoga, State of Ohio, haveinvented a new and useful Improvement in Burglar-Alarms, of which thefollowing is a full, clear, and exact description, reference being hadto the accompanying drawings, making part of this specification.

My invention relates to an improvement in burglar-alarms, moreparticularly to the alarm patented to A. O. Tonner, of Canton, Ohio,bearing number 338,319, and date May 23, 1886, consisting of a baseplate or frame, a gong, a hammer, escapement mechanism, a spring toactuate the same, and a lockingbar.

The object of this invention is to provide improved devices for lockingand releasing the cscapement-movement and for winding theactuating-spring.

lVit-h these ends in view my invention relates to certain features ofconstruction fa-nd combinations of parts, as hereinafter described, andset forth in the claims.

Figure 1 is a side elevation of a burglaralarm illustrating myinvention, (part of bell removed;) Fig. 2, a vertical sectional view;Fig. 3, a plan View, (part of bell removed';) Fig. 4, a plan view ofbase-plate with lockingbolt in position to lock the escapementmechanism. Fig. 5 is a similar view of same parts, showing the boltreleased to allow the escapement to sound the alarm; and Fig. 6 is aperspective of the locking-bolt.

In the drawings, A represents a base'plate, which may be made of anysuitable material, and is prowided with downwardly and outwardlyprojected leg portions 13 and elongated apertures, as G and D, thelatter enlarged at one of its ends to form a shoulder E. To the base Ais secured a spider-frame F, by which the gear is supported. The centerpost G is substantially of the form shown in Fig. 2, and turns insuitable bearings in the base-plate A and the spider F. To this post issecured a ratchet-wheel a, as shown in Figs. land 2, and on the post Gis loosely mounted a wheel, as II, having peripheral teeth I), as shownin Fig. 3, and to the under side of said wheel is pivotally secured ation J, the object of which is to, wind up the spring II about the postG, thus forming what is known as a stem-winder, and dispensing wlth aloose key. The escapement K, as

shown in Fig. 3, is arranged to engage the teeth I) of wheel H. To theescapement is a hammeear n 7c, having in its free end ahammer Z, bywhich the alarm is sounded on the bell L 5 and to arrest the movement ofthe escapement and the action of the hammer a spring-actuatedlocking-bolt M is provided, which may be made in various forms; but forthe purpose of this case I have shown one form in Fig. 6, the head m ofthe bolt being turned at right angles with body a, said body having aT-shaped portion, as 0, that is passed through the perforation C, asshown in Fig. 1, the neck portion parallel with the side walls of theperforation, and the head portion turned to cross the perforation tohold the front portionof the bolt in position, and when the bolt ispressed in, as shown in Fig. 1, to engage a pin, as p, projecteddownwardly from the hammer'actuating wheel II, by which engagement therotary movement of the wheel II will be arrested. Said bolt is alsoprovided with a hook portion, as g, turned up from the body of the bolt,which is passed through the narrow portion r of the slot D, and I turnedover the edge of the plate A, as shown 1 in Fig. 1, by which the rearportion of the bolt is loosely secured to the plate. The bolt is alsoprovided with a handle, as N, which may be of the form shown in Fig. 6,thrown off obliquely to the body portion of the bolt, or, if preferredor occasion require, the handle portion may be projected rearwardly, ona line parallel with the body; and, if preferred, the perforation D maybe curved into a semicircle, as the desired movement and object are toallow the bolt a longitudinal and transverse movement, to be free at oneend of the slot to move longitudinally overthe plate A, and to be lockedto said plate at the other end against such movement.

the door or window-jamb, and when released by opening the door orraising the windowsash, if the alarm is put to such use, the spring 3will throw the bolt forward, disengaging the upright portion 0 from thepin p, to allow the wheel H to rotate and sound the alarm. energythereof is exerted to throw the bolt longitudinally at its front portionand transversely at its rear portion.

I would not limit myself to the precise form of locking bolt or plateperforation, as the same results may be attained by other forms orshapes; but

What I do claim, and desire to secure by Letters Patent, is-

1. The combination, in an alarm-sounder, of the plate A, a bolt M,loosely secured thereto, having its ends m and N projected out- Thespring 3 is so situated that the j ect, the rear end portion N to formahandle by which said portion of the bolt may be thrown into or out ofengagement with the retaining-shoulder E, and a spring to throw the boltlongitudinally and transversely and to hold it out of engagement withthe movement and the shoulder, substantially as described, and for thepurpose set forth.

2. The combination, in an alarm, of the plate A, having a perforation Oon one side of its central portion and a perforation D on the otherside, diametrically opposite, or thereabout, the latter having aretaining-shoulder E, and a bolt M, having its ends m and N projectedoutside of the diameter of the plate A,

said bolt adapted at its front portion for a shoulder E to hold. theportion 0 in engagement with the movement, substantially as described,and for the purpose set forth.

In testimony whereof I have hereunto set my hand this 16th day of March,A. D. 1889.

GEORGE ARTER. WVitnesses:

N. W. CHAMBERLAIN,

W. L. HEMSTREET.

